function R = getsigma(mdl)
%GETREPR Gets the internal representation of sigma
%
% [ Syntax ]
%   - R = getsigma(mdl)
%
% [ Remarks ]
%   - Since the internal representation of sigma in full Gaussian 
%     model is simply the covariance matrix. This function returns the 
%     covariance matrix as the getcov.
%
% [ History ]
%   - Created by Dahua Lin, on Dec 23, 2007
%

R = mdl.sigma;